\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Child mortality at the child level}
\begin{tabular}{l*{3}{c}}
\toprule
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}\\
                    &\multicolumn{1}{c}{\textbf{\begin{tabular}[c]{@{}c@{}}0-5 years old\end{tabular}}}&\multicolumn{1}{c}{\textbf{\begin{tabular}[c]{@{}c@{}}0-1 year old\end{tabular}}}&\multicolumn{1}{c}{\textbf{\begin{tabular}[c]{@{}c@{}}1-5 years old\end{tabular}}}\\
\midrule
Full treatment      &       1.080   &       1.150   &       0.614   \\
                    &     (0.241)   &     (0.301)   &     (0.292)   \\
Information only    &       0.960   &       0.900   &       0.189***\\
                    &     (0.228)   &     (0.255)   &     (0.080)   \\
Interface only      &       1.166   &       1.145   &       0.970   \\
                    &     (0.245)   &     (0.278)   &     (0.396)   \\
\midrule
N                   &      20,371   &       9,171   &      17,363   \\
R$^{2}$             &               &               &               \\
P-value (Information = Interface)&       0.367   &       0.322   &       0.000   \\
P-value (Information = Full treatment)&       0.606   &       0.352   &       0.012   \\
P-value (Interface = Full treatment)&       0.702   &       0.986   &       0.323   \\
\hline              &               &               &               \\
F-test (joint significance of all 3 treatment groups)&       0.998   &       1.278   &      21.373   \\
P-value (joint significance of all 3 treatment groups)&       0.802   &       0.734   &       0.000   \\
\bottomrule
\end{tabular}
\end{table}
